perceptive

Synonyms: acute astute awake aware brainy conscious discerning discreet ear to the ground gnostic incisive insighted insightful intuitive judicious keen knowing knowledgeable knows what’s what observant penetrating penetrative percipient perspicacious quick rational responsive sagacious sage savvy sharp sophic tuned in wise wise to

Antonyms: dense insensitive unaware unobservant